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<head>
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    <title>Document</title>
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    <style>
        body{
            background: white;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="row" >
        <nav class="navbar navbar-default" role="navigation">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">
                    <span class="sr-only">Toggle navigation</span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                <a class="navbar-brand" href="#">学生管理系统</a>
            </div>


        </nav>
        <div class="col-sm-3">
            <div class="list-group">
                <a href="/" class="list-group-item list-group-item-action active">班级管理</a>
                <a href="#" class="list-group-item list-group-item-action">学生管理</a>
            </div>
        </div>
        <div class="col-sm-9">
            <form action="" method="POST" class="form-horizontal" role="form">
                <div class="panel panel-default">
                    <div class="panel-heading">
                        <h3 class="panel-title">班级管理</h3>
                    </div>
                    <div class="panel-body">
                        <div class="form-group">
                            <label for="" class="col-sm-2 control-label">学生名称</label>
                            <div class="col-sm-10">
                                <input type="text" name="name" class="form-control" id="" placeholder="">
                            </div>
                        </div>

                    </div>

                </div>
                <button  class="btn btn-primary">提交</>
            </form>
        </div>

    </div>
</div>
</body>
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